The sign for interest (as in "interesting or interested") starts with both hands in "5" shapes on or near your
chest and stomach. The dominant hand is
higher up. Both hands move forward and change into "8" handshapes.

INTEREST (interested / interesting)

Note: This is what the handshape looks like from behind:

Note: The sign "interesting" is
NOT used for the kind of interest
that accrues on borrowed money. That is signed by placing the pinkie
side of the right "I" handshape on the palm of your palm-up left flat-hand.
Then move the right "I" handshape in two counterclockwise circles on the left
palm. The pinkie-side of the the right hand is rubbing against the palm of the
left hand as you make the two small counterclockwise circles.